Year: 2025
Type: article
Abstract: The search for a giant Nernst effect beyond conventional mechanisms offers advantages for developing advanced thermoelectric devices and understanding charge-entropy conversion. Here, we study the Seebeck and Nernst effects in HfTe_{5} across a broad range of magnetic fields. Remarkably, the Nernst effect forms a giant plateau at ultrahigh magnetic fields (B>10B_{QL}), with the magnitude reaching up to 50 μV/K at 2 K. By tracking two magnetic-field-driven phase transitions predicted for weak topological insulators, we find that the giant Nernst plateau exists exclusively in the ideal 1D Weyl phase. Theoretical analysis further demonstrates that such a giant Nernst plateau arises from the unique thermoelectric conversion mechanism inherent to the ideal 1D Weyl phase, where the transverse thermoelectric effect (Nernst effect) is dominated by the longitudinal conduction channel. Our findings expand the understanding of ideal Weyl physics and open new avenues for significantly improving thermoelectric conversion efficiency.
Source: Physical Review Letters
DOI: 10.1103/4zlp-n5qm
Authors: Y. Zhang, J. Q. Cai, Peng-Lu Zhao, Q. Li, Y. C. Qian, Y. Y. Lv, Y. B. Chen, Q. Niu, Hai-Zhou Lu, J. L. Zhang, M. L. Tian
Institutions: University of Science and Technology of China, Chinese Academy of Sciences, High Magnetic Field Laboratory, National Laboratory of Solid State Microstructures, Nanjing University, Southern University of Science and Technology, Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area, Anhui University
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Funders: National Natural Science Foundation of China, Chinese Academy of Sciences, Ministry of Science and Technology of the People's Republic of China, Government of Guangdong Province, Science, Technology and Innovation Commission of Shenzhen Municipality, Southern University of Science and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, National Key Research and Development Program of China, Basic and Applied Basic Research Foundation of Guangdong Province
OpenAlex ID: W4415403128